OS patch: June 12, 2018—KB428483 never worked for me either (but I didn't expect it to to as a fix for the Epson issue was not mentioned in the release notes)
This was the response I got from Epson on 11 June regarding a timeline for a fix.
"In response to your email, at the minute there is no time frame but a formal escalation has been launched and it is now being reviewed by our Level 3 team in Japan. This issue is affecting other companies and not just Epson and we are trying to work with Microsoft to come up with a fix which we are hoping is sorted as quickly as possible."